scott



No. 609,950. Patented Aug. 30, I898.

C. N.' SCOTT.

PUMPING ENGINE.

(Application filed Jan. 15, 1897.) (No Model.)

2 Sheets-Sheet I.

ATIORN EYS.

we mums PETERS co, waroumm. wAsnmn'roN. u. c.

C 7% Jam INVENTOR.

No. 609,950. Patented Aug. 30, I898.

c. N. soon. PUMPING ENGINE.

(Application filed J an. 15, 1897.) (No Model.) 2 Sheets-$heet 2.

INVENTOR.

ATTORNEYS.

ATENT FFlCE.

CLARENCE N. SCOTT, OF BUFFALO, NEW YORK, ASSIGNOR TO THE SNOW STEAM PUMPWORKS, OF SAME PLACE.

PUMPING- ENGINE.

SPECIFICATION forming part of Letters Patent No. 609,950, dated August30, 1898..

Application filed January 15,1897. Serial No. 619,285. (No model.)

To all whom it may concern.-

Be it known that I, CLARENCE N. Soon, a subject of the Queen of GreatBritain, residing at Buffalo, in the county of Erie and State of NewYork, have inventeda new and useful Improvement in Pumping-Engines, ofwhich the admission of steam when the water-pressure falls below thenormal and decrease the admission when the pressure rises above thenormal.

The object of my invention is to produce a simple, compact, andsensitive regulator of this character.

In the accompanying drawings, consisting of two sheet-s, Figure 1 is aside elevation of.

the steam-cylinder of a pumping-engine and the automatic cut-offregulator connected therewith. Fig. 2 is a vertical section, on anenlarged scale, of the diaphragm and connecting parts which are actedupon by the waterpressure. Fig. 3 is a horizontal section, on anenlarged scale, of the regulator screw-stem and connecting parts. Fig.4. is a rear end view of the same. Fig. 5 is a horizontal section, on astill larger scale, of the regulator screw-stem and connecting parts.Fig. G is a front end View of the same, partly in section.

Like letters of reference refer to like parts in the several figures.

A represents the steam-cylinder of a pumping-engine, which cylinder andits valve-gear sents the arms of the cut-off earns, which arms arearranged concentric with the arms of the admission-valves and are heldin position by rods d", extending upwardly to arms The arm E, whichextends downwardly from its rockshaft 6, connects with one of the rods61, and the arm a connects with the other rod d and forms an extensionof the arm E" or is secured to the same rock-shaft, so that by shiftingthe arm E or its rock-shaft in one or the other direction both cut-offcams are correspondingly shifted. This arm E is usually shifted by handfor changing the cut-ofi and secured in its adjusted position by asetscrew f aud a clamping-screw f, engaging with a segment f All ofthese devices may be of any ordinary construction. My improved cut-offregulator connects with this arm E or with an arm on the same rock-shaftand shifts the cut-off devices controlled there by automatically. Theusual set-screw and clampingscrew shown in the drawings are releasedwhen the automatic regulator is employed. This automatic regulatingmechanism is constructed as follows:

G represents a horizontal screw-stem which is provided at its rear endwith a bifurcated head g, to whichv is pivoted a horizontal rod g,.whichconnects the screw-stem with the arm E or some other arm on the cut-offrockshaft 6, so that the longitudinal movement of the screw-stem shiftsthe cut-off rock-shaft and the cut-off devices connected therewithaccordingly. The screw-stem is held against rotary movement by theconnecting-rod g and passes through an internally-threaded sleeve H,which is journaled in a bearing H, carried by a bracket 11?. The latteris secured to any suitable stationary support,

which may be a part of the pumping-engine or apipe attached thereto. a His free to turn in the bearing I-I, butis held against longitudinalmovement therein by a collar h, attached to the inner end of the sleeve,and a collar it, formed on the outer end thereof. A detent-spring IE2 issecured to the rear portion of the bracket-bearing and bears against therear collar h with sufficient friction to hold the screw-sleeve againstrotation except when turned by force applied to the sleeve.

I represents a ratchet-wheel which is secured to the front endof thescrew-sleeve, and J represents aduplex pawlwhich-embraces or straddleswith its arms part of the face of the ratchet-wheel andwhich is so con-The screw-sleeve. i

structed that both of its arms may be simultaneously out of engagementwith the ratchetwheel, as shown in Fig. 6, or that either of its armsmay engage with the ratchet-wheel. In the construction of the duplexpawl shown in the drawings the pawl-heads t' are detachable steel blockswhich are clamped by screws t" in sockets formed in pawl-carriers Thelatter are pivoted between bifurcated jaws i formed on the hub 71 Thepivoted pawl-carriers are pressed toward the ratchet-wheel by a springj,which is secured to the hub 2' and bears with its ends upon the outerends of the pawls, and the pawl-carriers are prevented from swinginginwardly beyond their normal position by square shoulders j at the innersides of their pivots, while they are free to swing outwardly againstthe spring-pressure in sliding over the teeth of the ratchet-wheel, thespring returning each pawl-carrier to its normal position after the pawlhas cleared the tooth.

The duplex pawl is secured with its hub to a horizontal pin K, whichlatter is journaled in a double or bifurcated horizontal rock-arm L,mounted with its hub 1 upon the cylindrical portion of thebracket-bearing H, so as to be capable of a rocking movement about theaxis of the regulator screw-stem. The reduced rear portion of the pin Kis journaled in the two parts of the rock-arm L and connects with theupper end of an upright rod M, whose head m is arranged between the twoparts of the rock-arm and embraces the reduced portion of the pin K. Therod M re ceives a Vertical reciprocating movement by any suitablemeans-for instance, by connection with a rock-arm m of the valvemechanism, as represented in Fig. 1.

The vertical reciprocating movement of the rod M produces a rockingmovement of the arm L and the duplex pawl connected therewith. So longas both arms of the duplex pawl are disengaged from the ratchet-wheel,as shown in Fig. 6, the reciprocating movement of the pawl produces noeffect upon the regulator screw-stem and the latter and the cut-offdevices controlled thereby do not change their position. If the pin K,to which the duplex pawl is secured, be slightly turned about its axis,so as to throw one of the pawlarms into engagement with theratchet-wheel, the latter is actuated by such arm and the regulatorscrew-stem is moved in one or the other direction and the position ofthe cutoff devices is correspondingly changed. The position of the pawlis automatically controlled by the following mechanism, which isactuated by the pressure of the water:

N represents a shallow chamber to which the water-pressure is admittedby a pipe nand the bottom of which is formed by a flexible diaphragm n,which is held up against the water-pressure by an adjustable spring nThe spring-pressure is so regulated as to balance the water-pressurewhich is to be maintained.

0 represents a horizontal lever which is pivoted to the chamber N- onone side thereof and which connects with its short inner arm to thecoupling 0', by which the upperend of the spring is attached to thediaphragm, and so follows the movements of the diaphragm. The long outerarm of the lever O is connected by a vertical rod P (shown in full linesin Figs. 3 and 5) with a crank-arm p, which is secured to the front endof the pin K. The point of attachment of the rod P to the crankarm 19 isarranged in line with the axis of the regulator-screw, so that in thenormal position of the diaphragm and connecting parts the crank-armrocks with the pawl-supporting arm about the axis of the regulatorscrewstem as a center and holds both arms of the duplex pawl out ofengagement with the ratchetwheel. lVhen the water-pressure rises abovethe normal, the diaphragm is defiected downwardly by the water-pressure,whereby the long arm of the lever O and the rod P are raised, throwingthe inner end of the crank-arm p upwardly out of center and throwing thelower arm of the duplex pawl into engagement with the ratchet-wheel. Thelatter and the screw-sleeve are now turned by the pawl in the directionof the arrow 1, Fig. 6, whereby the regulator screw-stem is movedbackwardly in the direction of the arrow 2, Fig. 5. This movement of thescrew-stem shifts the position of the cut-off devices in such mannerthat the steam is cut off sooner, and this movement of the screwcontinues until the water-pressure has fallen to the normal, when thediaphragm is returned to its normal position by the spring and the leverconnected with the diaphragm returns the crank-arm to its normalposition and throws the pawl out of engagement. hand, the water-pressurefalls below the normal, the diaphragm is raised by the spring, the outerarm of the rock-lever and the connecting-rod descend, the crank-arm isthrown out of center downwardly, and the upper pawlarm is thrown intoengagement with the ratchet-wheel, turning the latter and thescrew-sleeve in the direction of the arrow 3, Fig. 6, and moving thescrew-stem forwardly in the direction of the arrow 4t, Fig. 5. Thismovement of the screw-stem shifts the cutoff devices so as to cut offlater and continues until the normal water-pressure has been restored,when the pawl is again automatically thrown out of gear by the diaphragmand connecting parts.

In order to prevent the forward movement of the screw-stem beyond a safelimit if the water-pressure should fall very far below the normal, sothat it cannot be restored before the practical limit of the forwardmovement of the screw-stem has been reached, an automatic disengagingdevice is provided which throws the pawl out of gear when the limit ofthe permissible or desirable forward movement of the screw-stem has beenreached. This disengaging device consists of a bifur- If, on the otherment of the disengaging-arm with the screW- stem. The engagement of thedisengaging device in the slot of the pawl connects the same with thepawl and causes the disengaging device to rock with the pawl and enablesthe disengaging device to follow the longitudinal movement of thescrew-stem. During the ordinary play of the screw-stem the disengagingdevice stands at a greater or less distance in front of the pawl, asindicated in Fig. 3. WVhen the screw stem has about reached the limit ofits permissible forward movement, the inclined head of the disengagingdevice lifts the upper paWl-arm out of engagement, as shown in Fig. 6,and so stops the further forward movement of the screw-stem.

While the described and illustrated details of construction of thevarious devices which enter into my automatic cut-off regulator are welladapted for producing the desired results and are the best known to mefor the purpose, I do not Wish to be limited in all respects to thesame, as they can be modified in various ways without substantialdeparture from my invention.

I claim as my invention-- 1. The combination with alongitudinallymovable regulator-stem, a rotatory screwsleeve engagingthe same, a stationary bearing in which said sleeve is held againstlongitudinal movement, and a ratchet-Wheel secured to said sleeve, of apawl-carrier mounted to oscillate concentric with said stem and sleeve,a duplex pawl carried by said support, and a pressure device wherebysaid pawl is automatically engaged with and disengaged from saidratchet-wheel, substantially as set forth.

2. The combination with a regulator screw stem and sleeve provided withan actuating ratchet-wheel, of a pawl-support mounted to oscillateconcentric with said screw stem and sleeve, a duplex pawl mounted onsaid support and provided with a crank-arm having its free end arrangedin line with the axis of said stem and sleeve, and a pressure deviceconnected with the free end of said crankarm and adapted to shift thesame and the duplex pawl, substantially as set forth.

3. The combination with a regulator screw stem and sleeve provided withan actuating ratchet-wheel, of an arm mounted to oscillate concentricwith said stem and sleeve, a pin j ournaled in the free end of said armparallel with the screw stem and sleeve, a duplex pawl secured to saidpin and adapted to engage said ratchet-wheel, a crank-arm secured tosaid pin and having its free end arranged in line with said stem andsleeve, and a pressure device connected with the free end of saidcrank-arm, substantially as set forth.

4. The combination with a longitudinallymovable regulator screw-stem, ofa rotatory screw-sleeve engaging therewith, a ratchet mechanism wherebysaid sleeve can be rotated, a water-pressure device which automaticallycontrols the operation of said ratchet mechanism, and a disengagingdevice Whereby the ratchet mechanism is thrown out of gear when theregulator-stem has reached the desired limit of its movement,substantially as set forth.

5. The combination with a longitudinallymovable regulator screw-stem, ofa rotatory screw-sleeve engaging therewith and provided with aratchet-wheel, an oscillating pawl-support, a pawl mounted on the sameand having a longitudinal groove in its hub, and a disengaging-armconnected with said stem and guided in said groove and having aninclined head adapted to disengage the pawl,

substantially as set forth.

Witness my hand this 9th day of January, 1897.

CLARENCE N. SCOTT.

WVitnesses:

JNo. J. BONNER, EDWARD WILHELM.

